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12. The Doppler effect results different sounds being heard by the observers due to a change in frequency and position relative to the motion. Explain

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12. The Doppler effect results different sounds being heard by the observers due to a change in frequency and position relative to the motion. Explain how this happens using diagrams if necessary to support your answer. (4) 13. If a jet is travelling at a Mach number of 2.3, how far can it travel in 2 hours? (3)

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